Question

Which of the following materials fall in the category of a pure substance?
$\left(a\right)$ Ice
$\left(b\right)$ Milk
$\left(c\right)$ Iron
$\left(d\right)$ Hydrochloric acid
$\left(e\right)$ Calcium oxide
$\left(f\right)$ Mercury
$\left(g\right)$ Brick
$\left(h\right)$ Wood
$\left(i\right)$ Air

Answer 1

Pure substances are defined as substances that are made of only one type of atom or molecule.

The pure substances are:

(a) Ice

(c) Iron

(d) Hydrochloric acid

(e) Calcium oxide

(f) Mercury